Looking to explode wood block in 2.8
You may have a look at Cell Fracturing, either the standard in-build one or the standalone add-on version. There are many great tutorials for it on YouTube, too. 

Maybe you can adapt this tutorial from CGGeek? You only need to add a ground (rigid body, passive type), play with the shard settings (wood usually has a high number of long splinters) and maybe use an object to push the wood from behind instead of below. Also, no smoke sim needed, obviously.
https://www.youtube.com/watch?v=J70DijACZm0

Another (older) tutorial, could serve as a reference for settings:
https://www.youtube.com/watch?v=w_m81zF9WtY